Amelioration of phytotoxic effects of Cd on mung bean seedlings by gluconic acid secreting rhizobacterium <Emphasis Type="Italic">Enterobacter asburiae</Emphasis> PSI3 and implication of role of organic acid |
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Authors: | B Kavita Sapna Shukla G Naresh Kumar G Archana |
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Institution: | (1) Department of Microbiology and Biotechnology Center, Faculty of Science, Maharaja Sayajirao University of Baroda, Vadodara, 390002, Gujarat, India;(2) Department of Biochemistry, Faculty of Science, Maharaja Sayajirao University of Baroda, Vadodara, 390002, Gujarat, India |
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Abstract: | Mung bean seedlings inoculated with Enterobacter asburiae PSI3, a gluconic acid-producing rhizosphere isolate, enhanced plant growth in the presence of phytotoxic levels of Cd2+ in gnotobiotic pot experiments as compared to the uninoculated Cd-treated plants. Addition of organic acids to Cd-stressed
seedlings promoted root elongation. Hematoxylin competition assays showed that organic acids could displace Cd2+ from the Cd2+: hematoxylin complex in the same order of effectiveness as was found for restoration of root net elongation viz. oxalate > malate > succinate
while gluconate was effective at higher concentrations. Root associated Cd2+, assessed by hematoxylin staining of roots was found to be reduced when roots were treated with organic acid. Cd stress increased
antioxidant enzymes such as peroxidase and superoxide dismutase in mung bean roots while organic acid treatment suppressed
the up-regulation of these enzymes by Cd. |
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Keywords: | Enterobacter asburiae PSI3 Cadmium toxicity Organic acids Mung bean Catalase Peroxidase |
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